Carburetor



March 1l 1927.

E.. W. PAG ETT' CARBURETOR Filed June4 23, 192,2

thun/wm Patented Mar. 1, 1927.

4militair. ein reE'.i"1,or DETROIT, MCHIGAN.

1cfmBUREToR.

Application filed `.Tune :23, 1922.

this gpurpose. Anotherfobject is to improve.

.the :method-s .whereby liquids are varporized or earbureted.

To these yand other ends, my 'invention may consist in a liquid fuelcarburetor for interna-l lcombustion engines, a single em .bodfiment :of which is shown in vthe -draivings, wherein: v

Figure -1 4is a lvertical .section of -a vapor- .izer yor carburetor Iembodying my invention g Eig. 2 is .an elevation looking from the .left of l, of av fragmentary portion of the carburetor, part-s .being r-en'ioved `to -disclose ,the jet chamber and fluid imponer;

F 3 is a View similar to Fig. Q., showing the cover plateand shutter in place, Vand l is a fragmentary sectgon correpending to Figs. 2 yand 3, Itaken .in the plane .of the line .IV-JV.

The apparatus of my invention, in its present application may embody, in common with the usual types of carburetor-s, a 'throttle chamber l, of any suitable form having van fopen end flanged or otherwise yadapted for attachment to the engine .port

30 -or manifold, and za float vchamber 2 including or :adapted :to :include the usuall float chamber mechanism and accessories. The .throttle chamber .is provided as shown in 1*" ig. l Wi'thia butteriy throttle valve irig- 'idly .mounted lon the -tlirottle valve shatt- 4 which -is adapted `to be operated .in the usual manner, either :automatically (or manually or bot-h, for cont-rolling and ladju-sting :the engine..-speed and power output. VFor this purpose -a suitable throttle gear is usually provided.. lVithin the -iioat-chamberQa constant level supply of fuel is stored for sup- ,plying ythe Vsprayapparatus. The level of this liquid fuel is maintained @by ra float 5 operating a float valve 6 through the Vfloat tlever 7 pivoted at 8. The supply pipe 9 is connected to .the seat of the valve l6 by s: union 'connection IO.

Two chambers are conveniently included within thecylindricalcasing 11 formed contiguously to the throttle and float chambers. One end, the entrance end- -of this casing communicates With the atmosphere or, if necessary YWith a .--duct or chamber supplying the gaseous constituent or vehicle of the mixture. The other end of the casing 1l Serial No. 570,448.A

discharges `into the throttle chamber. The

reason for this preference Will presently. be clear. At the entrance end of the `generator casing, the spray Ichamber l2 is situated, the conditionlng chamber 1.3 is situated at the ydischaiyge end of the casing. chamber provides a passage, which maybe annular in form, for the air entering the carburetor. rPhe liquid fuel jet is also sprayed into this passageand vthus the air The `spray and liquid fuel are initially brought Vtou.

gether.

The liquid fuel is .sprayed into the air sin .or passing through the spray chamber `under relatively high pressure. A `fine division and high velocity of the :jet is thus obtained.

To this end a pump "for drawing the fuel from the ioat chamber .and forcing ftheV Aatomized :spray into the spray chamber i-s provided,

- Thispump is best .shown in Figs. l :and f 2 and is preferably of a positive flow rotary type. The lcylindrical pump chamber 20 may be formed integral With the .perforated septum or partition wallvQl separating the spr-ay `and conditioning chambers. An im- `peller fhead V22, rigidly mounted on the pump spindle 23 liournaled at :24 .and 25., 'fitssnugly and is rotatable Wit-hin `the pump chamber. A `plurality of scoop blades, or :revolving ring pistons '26 are pivotal'ly secured to the impellerhelad; Theseimay be yieldingly held outward Aby .sp-ring means, but this is notnsually neccessary, since centrifugal forces and @the pressures incidental lto the Dump operation will hold `:their outer Y .ends in contact with-the peripheral avall :of .thepump chamber. These blades fit ifneely .but :snugly within the pump chamber. The inlet duct 27 of thepump is provided Vwith .a feed` tube 28 having 'an upwardly facing sreturn ,bend at its lower end. The outlet -orj delivery duct 29 delivers .the fluid from the pump .to fa. -spray orifice for Anozzzle 4under Vpressure.y Obviously a plurality or system (of orifices or nozzles ofv-arou-s forms vmay be used, buta single :simple :orifice opening from vthe nduct 29 into the :spray chamber l2 and provid-ed with the .adjustable needle valve 30, which fboth :controls and spreads the fue'ljet, haS `proven satisfactory. The

delivery duct 29 is provided with a spring loaded bypass or relief valve S'lcomm'unieating' Vwith the float' chamber .through the by-pass .duct 32. This automatically controlsl the spray jet pressure', permits the surllO plus discharge ol the pump to return to the fioat chamber or cistern, and guards against overloading the pump. i

The pump spindle 23, passing through .its bearing Q5, carries the paddle wheel or fan 33 rigid and rotatable therewith. The adjacent end, 23, of' this spindle is enlarged to accommmlate a tclcscoping journal bearing for supporting the end of the pump spindle driving shaft 3l, and is journallcd iu the hub $35. Rigid with the end 23a ot the pump spindle is a toothed driven clutch melnber 36. 'lhc corresponding clutch member 3T is mounted on the squared section 38 of `the driving shaft 34 to be `rotatably rigid but axially sl idable thereon. The driving sha ift is jourmillrd at 3.() and its outwardly extending portion is squared at 40 to receive the two halves L,ll and 42 of the split V groove pinch pulley which engages with and is adapted to be driven by the bevel rimmed Wheel 43. The compression spring 4A is adapted to insure a yielding frictional cngagement between the pulley and wheel.

The Wheel a3 is journallcd on a stationary arbor 45 rigid with the body ot the throttle chamber. This wheel is adapted to be mechanically driven from a rotating shatt of the engine to which the mixture generator is applied. A llexible shaft etti is accordingly shown coupledito the hub of the wheel and may be attached at its other end to the enginecam shaft. i

For operating, i. e. engaging and disengaging the clutch members 36 and 3T, and thus connecting and disconnecting the `driving shaft 34 to ithefan spindle; a` clutch gear is provided. This may embody a yoke 47 swivel connected to the slidable clutch member 3T and rigidly secured at its other end to a plunger rod 4S slidably mounted in the throttle chamber body. i To the outer end or head of the plunger rod, is secured a link or wire 49 which extends to a suitable manual or automatic control device whereby the clutch may he selectively engaged and disengaged. A compression spring 50 may be provided to normally hold the clutch in engagement. y

The air inlet is provided for `by the entrance'apertures 5l through the outer end wall 52 of the casing l1 and for adjusting the sizeof these openings, a shutter valve or disc gate 53 is provided. The shutter 53 `may conveniently be pivoted about a hub projecting from the outer face of the Wall and is held in place by the spring washer 5a secured by a screw The ears 56 are provided as finger grips for convenience in n'ianipulating the shutter to regulate the apertures 51. y y i p The spray chamber 12 is supplied with air or other gaseous vehicle or` charge component through these entrance apertures and discharges into the conditioningchamber 13 through the marginally disposed apertures 2l of the wall 21. The conditioning chamber in turn discharges into the throttle chamber l through the centrally disposed charge passage 13'. The rotary paddle 33 serves as atomizing means tor any liquid particles ol the mixture which may enter the conditioning chamber.

Co-incidently with the piston movement in the engine to whichihc carini-.rotor or mixture generator illustrated has `been applied, the drive shaft 34 is rot-ated by its connections with the engine, and since the pump spindle .is normally connected to its drive shrl't.y the pump and paddle are likewise rotated. Thus the suction or intake draft of the engine and the rotation ot the pump and paddle system with their consequent functions normally occur simultaneously.

Any fluid substance not atomized or conditioned in the conditioning chamber may collect and drip back into the float chamber through the drip passage :77. A similar drip duct 5S is provided for returning the liuid products ol condensation from the throttle chamber to the float chamber.

ln addition to conditioning the charge s eiuu'ated. the paddle 33 may impel or assist in delivering the charge to the throttle chamber thus approaching in function or constituting a supcrcharge for the engine.

Having thus described my in vent-ion, what l claimis:

ln a carburetor having a float chamber and a `manifold connectionabove the float chamber and to one side thereof, a cylin drical casing on the float chamber of said carburetor and at one side of the manifold connection.y said cylindrical casing having a wall formed in part hy the manifold connection and an end Wall and intermediate transverse partition, said partition dividing said cylindrical casing into a conditioning cham# ber adapted to receive air and adapted to receive fuelifrom said float chamber7 and a spray chamber adapted to receive fuel from said conditioning chamber and discharge it into said manifold connection,` a rotary fluid pump adapted to supply tuelto said conditioning chamber from said float chamber, a

rotary paddle in said spray chamber adapt ed to force fuel into said manifold connection, and means axially of said rotary pump and said paddle and extending through said manifold connection and operatable at the side ol" said manifold connection opposite said cylindrical casing Afor driving said pump and paddle.

l'n testimony 4whereotl allix my signature. i

EARL lV. PAGETT. 

